Elliott Carter, the American composer whose kaleidoscopic, rigorously organized works established him as one of the most important and enduring voices in contemporary music, died on Monday in Manhattan. He was 103 and had continued to compose into his 11th decade, completing his last piece in August.

His death was announced by Virgil Blackwell, his personal assistant. Mr. Carter died in his Greenwich Village apartment, which he and his wife bought in 1945 and where he had lived ever since.

...Many of Mr. Carter's works had found their way into the active repertory. In the mid-1980s, he observed that hardly a year went by without at least one New York performance of his Double Concerto for Harpsichord and Piano With Two Chamber Orchestras (1961). His Cello Sonata (1948) is considered one of this century's finest additions to that instrument's repertory, and his solo keyboard works, the Piano Sonata (1946) and "Night Fantasies" (1980), are performed regularly and have been recorded several times. [NY Times]

Rest in peace, Elliott. A video of one of his pieces being performed is below.